Solar flares on April 20, 2001
The most powerful solar flare in 24 hours
M4.1 (strong) flare - April 20 at 8:04 PM
Solar activity index
Value as of the end of the day on April 20, 2001
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from April 19, 2001 to April 20, 2001
Time zone — UTC+00
List of solar flares for April 20, 2001
The total number of solar flares of class C and higher — 10 flares
C class — 8 | M class — 2 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| C8.0 | 21:28 | 21:34 | 21:40 | — |
| M4.1 | 19:51 | 20:04 | 20:16 | 9433 |
| C4.0 | 19:05 | 19:16 | 19:22 | 9433 |
| C2.2 | 18:20 | 18:32 | 18:39 | — |
| C1.8 | 16:54 | 16:58 | 17:01 | — |
| C4.2 | 14:07 | 14:17 | 14:28 | — |
| C7.0 | 12:53 | 13:04 | 13:17 | — |
| C1.5 | 08:46 | 08:50 | 08:53 | 9432 |
| C1.9 | 07:05 | 07:09 | 07:12 | 9433 |
| M1.0 | 05:01 | 05:23 | 05:43 | 9433 |